for your HALIon 5 ugrade I do the same thing you want do upgrade from HAlion Sonic 1 to HALion Sonic 2 then after upgrade to HALion 5, this is the same license for Sonic & HALion (cannot use on a different computer), and there is a download version of HALion 5 (just the program & the lib from HALion 4) cause all of the libraries is the same for HALion Sonic 2 & HALion 5.
Yes Steinberg gonna ask you some proof for the educational license.
don’t know about the Grand.